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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE appref SYSTEM "appref.dtd">
<appref>
<header>
<copyright>
<year>1999</year><year>2015</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
The contents of this file are subject to the Erlang Public License,
Version 1.1, (the "License"); you may not use this file except in
compliance with the License. You should have received a copy of the
Erlang Public License along with this software. If not, it can be
retrieved online at http://www.erlang.org/.
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
the License for the specific language governing rights and limitations
under the License.
</legalnotice>
<title>ssl</title>
<prepared></prepared>
<docno></docno>
<date></date>
<rev></rev>
<file>ssl_app.sgml</file>
</header>
<app>ssl</app>
<appsummary>The ssl application provides secure communication over
sockets.</appsummary>
<description></description>
<section>
<title>DEPENDENCIES</title>
<p>The SSL application uses the <c>public_key</c> and
Crypto application to handle public keys and encryption, hence
these applications must be loaded for the SSL application to work.
In an embedded environment this means they must be started with
<c>application:start/[1,2]</c> before the SSL application is
started.</p>
</section>
<section>
<title>CONFIGURATION</title>
<p>The application environment configuration parameters in this section
are defined for the SSL application. For more information
about configuration parameters, see the
<seealso marker="kernel:application">application(3)</seealso>
manual page in Kernel.</p>
<p>The environment parameters can be set on the command line,
for example:</p>
<p><c>erl -ssl protocol_version "['tlsv1.2', 'tlsv1.1']"</c></p>
<taglist>
<tag><c><![CDATA[protocol_version = <seealso marker="kernel:error_logger">ssl:protocol()</seealso> <optional>]]></c>.</tag>
<item><p>Protocol supported by started clients and
servers. If this option is not set, it defaults to all
protocols currently supported by the SSL application.
This option can be overridden by the version option
to <c>ssl:connect/[2,3]</c> and <c>ssl:listen/2</c>.</p></item>
<tag><c><![CDATA[session_lifetime = integer() <optional>]]></c></tag>
<item><p>Lifetime of the session data in seconds.</p></item>
<tag><c><![CDATA[session_cb = atom() <optional>]]></c></tag>
<item><p>Name of the session cache callback module that implements
the <c>ssl_session_cache_api</c> behavior. Defaults to
<c>ssl_session_cache.erl</c>.</p></item>
<tag><c><![CDATA[session_cb_init_args = proplist:proplist() <optional>]]></c></tag>
<item><p>List of extra user-defined arguments to the <c>init</c> function
in the session cache callback module. Defaults to <c>[]</c>.</p></item>
<tag><c><![CDATA[ssl_pem_cache_clean = integer() <optional>]]></c></tag>
<item>
<p>
Number of milliseconds between PEM cache validations.
</p>
<seealso
marker="ssl#clear_pem_cache-0">ssl:clear_pem_cache/0</seealso>
</item>
</taglist>
</section>
<section>
<title>ERROR LOGGER AND EVENT HANDLERS</title>
<p>The SSL application uses the default <seealso marker="kernel:error_logger">OTP error logger</seealso> to log unexpected errors and TLS alerts. The logging of TLS alerts may be turned off with the <c>log_alert</c> option. </p>
</section>
<section>
<title>SEE ALSO</title>
<p><seealso marker="kernel:application">application(3)</seealso></p>
</section>
</appref>
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